Model: CProduction Years: 1938-1939Description:50mm F3.5Original "Brick" Rangefinder Argus.Notice there is no gear between the lens and the rangefinder.The Earliest of these had a "dual range" switch for 2 range (fast & slow) shutter speeds.

Model: C2Production Years: 1938-1942Description:50mm F3.5Similar to the C, but with the Rangefinder coupled to the lens with a gear and NO flash attachment holes on left end.

Model: C3Production Years: 1939-1957Description:50mm F3.5Similar to the C2, but with flash sync attachment holes on left end.

Photo courtesy of Jerry Vincent

Model: C3 StandardProduction Years: 1958-1966Description:50mm F3.5Accessory shoe, and other features constant throughout its production.Ten digit serial number stamped on the bottom of the camera.

Photo courtesy of Bob Bowman

Model: C3 MatchmaticProduction Years: 1958-1966Description:50mm F3.5"Simplified" exposure system, to work only with Accessory Meter.Similar to the standard C3 but two tone leather.